Quick answer: 1 Watt-hour (Wh) in Kilowatt-hour (kWh)
1 Wh equals 0.001 kWh. To convert Watt-hour (Wh) to Kilowatt-hour (kWh), multiply by 0.001 using the free calculator above — no signup needed.
Energy & Work units
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About Energy & Work Converter
The Energy & Work Converter converts between 7 different units, including Joule, Kilojoule, Calorie, Kilocalorie (kcal), Watt-hour (Wh). The base unit is the Joule, and every other unit on this page is defined as an exact multiple of it. Type any value into the calculator above to convert instantly — free, unlimited, no signup and nothing to install.
Common equivalents: 1 Joule = 0.001 Kilojoule, 0.239006 Calorie, 0.000239006 Kilocalorie (kcal).
Scale of this category: the smallest unit is the Joule (J) and the largest is the Kilowatt-hour (kWh) (kWh).
Last updated: 2026-09-15
Energy & Work conversion factors
| Unit | Symbol | Value in Joule |
|---|---|---|
| Joule | J | 1 J = 1 J |
| Kilojoule | kJ | 1 kJ = 1000 J |
| Calorie | cal | 1 cal = 4.184 J |
| Kilocalorie (kcal) | kcal | 1 kcal = 4184 J |
| Watt-hour (Wh) | Wh | 1 Wh = 3600 J |
| Kilowatt-hour (kWh) | kWh | 1 kWh = 3600000 J |
| BTU | BTU | 1 BTU = 1055.06 J |
Worked Examples
See exactly how the conversion works with real numbers, step by step.
How much is 1 Watt-hour (Wh) in Kilowatt-hour (kWh)?
- Multiply 1 by the conversion factor 0.001
- 1 Watt-hour (Wh) = 0.001 Kilowatt-hour (kWh)
How much is 100 Watt-hour (Wh) in Kilowatt-hour (kWh)?
- Multiply 100 by the conversion factor 0.001
- 100 Watt-hour (Wh) = 0.1 Kilowatt-hour (kWh)
How much is 1000 Watt-hour (Wh) in Kilowatt-hour (kWh)?
- Multiply 1000 by the conversion factor 0.001
- 1000 Watt-hour (Wh) = 1 Kilowatt-hour (kWh)
Quick Conversion Reference Table
| Watt-hour (Wh) (Wh) | Kilowatt-hour (kWh) (kWh) |
|---|---|
| 1 Wh (Watt-hour (Wh)) | 0.001 kWh (Kilowatt-hour (kWh)) |
| 2 Wh (Watt-hour (Wh)) | 0.002 kWh (Kilowatt-hour (kWh)) |
| 5 Wh (Watt-hour (Wh)) | 0.005 kWh (Kilowatt-hour (kWh)) |
| 10 Wh (Watt-hour (Wh)) | 0.01 kWh (Kilowatt-hour (kWh)) |
| 20 Wh (Watt-hour (Wh)) | 0.02 kWh (Kilowatt-hour (kWh)) |
| 50 Wh (Watt-hour (Wh)) | 0.05 kWh (Kilowatt-hour (kWh)) |
| 100 Wh (Watt-hour (Wh)) | 0.1 kWh (Kilowatt-hour (kWh)) |
| 500 Wh (Watt-hour (Wh)) | 0.5 kWh (Kilowatt-hour (kWh)) |
| 1000 Wh (Watt-hour (Wh)) | 1 kWh (Kilowatt-hour (kWh)) |
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FAQ
How much is 1 Watt-hour (Wh) in Kilowatt-hour (kWh)?
1 Watt-hour (Wh) = 0.001 Kilowatt-hour (kWh).
How do I convert Watt-hour (Wh) to Kilowatt-hour (kWh)?
Enter your value in Watt-hour (Wh) into the converter above and the result in Kilowatt-hour (kWh) appears instantly. 1 Wh equals 0.001 kWh — just multiply your value by 0.001.
What is the formula for Watt-hour (Wh) to Kilowatt-hour (kWh)?
The formula is: value in Kilowatt-hour (kWh) = value in Watt-hour (Wh) × 0.001. For example, 100 Wh × 0.001 = 0.1 kWh.
Is this Watt-hour (Wh) to Kilowatt-hour (kWh) converter free and accurate?
Yes. This Watt-hour (Wh) to Kilowatt-hour (kWh) converter is 100% free, uses the exact international conversion factor (0.001), and works on any device with no signup.
How do I convert Kilowatt-hour (kWh) back to Watt-hour (Wh)?
To convert back, divide by 0.001 (or multiply by 1000). You can also use our dedicated How Many Watt-hour (Wh) in 1 Kilowatt-hour (kWh)? page for instant results.
Do I need to download an app or sign up?
No. The converter runs entirely in your browser — nothing to install, no account, no fees. It even keeps working offline once the page has loaded.
Which Energy & Work units are supported?
This converter supports 7 units: Joule, Kilojoule, Calorie, Kilocalorie (kcal), Watt-hour (Wh), Kilowatt-hour (kWh), BTU.